<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
     <!-- form表单区域 -->
      <!-- action发送表单的地址 -->
       
    <form action="">
      用户名：<input type="text">
      <br><br>
      密码：<input type="password">
      <br><br>
      <button type="submit">提交</button>
      <button type="reset">重置</button>
      <button type="button">普通按钮</button>

      <!-- 如果省略type属性，功能是提交 -->
    </form>

</body>
</html>